如题：
UserServiceProxy userServiceProxy = new UserServiceProxy();
//userServiceProxy.HostURL = "http://localhost/K3Cloud/ ";
userServiceProxy.HostURL = "http://10.19.33.84/K3Cloud/ ";
LoginInfo loginInfo = new LoginInfo();
//loginInfo.AcctID = "5693549dac8ba8";
loginInfo.AcctID = "000e1ead4162a9e311e5982210cf264a";
loginInfo.Username = "ssc";
loginInfo.Password = "888888";
loginInfo.Lcid = 2052;
var ret = userServiceProxy.ValidateUser("", loginInfo);
报错：
程序运行遇到了未知的错误：
错误提示：Value cannot be null.
Parameter name: dcInfo
错误堆栈：
at Kingdee.BOS.ServiceFacade.KDServiceClient.KDServiceClient.DoPost(KDBaseRequest kdrequest)
at Kingdee.BOS.ServiceFacade.KDServiceClient.KDServiceClient.Execute[T](KDBaseRequest request)
at Kingdee.BOS.ServiceFacade.KDServiceClient.BaseServiceProxy.ExecuteService[T](String method, Object[] args)
at K3CloudServiceInterface.K3CloudServiceInterface.ImportProjectData(String receiveXml) in
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